JPS61209498A - Simultaneous recording/reproducing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simultaneous recording/playback method in a digital recording/playback device using a digital memory such as a semiconductor memory.

[Conventional technology]

A weather forecast notification service using a telephone network is a service that records a voice message regarding the weather forecast on a specific recording/playback device connected to the telephone network, connects it to the user's line, plays the recorded message, and notifies the user. be.

FIG. 3 is a block diagram showing a connection method for a weather forecast notification service in the current telephone network. In the same figure, 1
．． 2 is a switching device, 3.5 is a recording/playback device, 4 is a recording input device, 6 is a distribution amplifier, 7 is a telephone, 8 is a subscriber line, 9
is an exchange.

Next, the operation of the notification service will be explained. First, in Figure 3,
When the contacts a of the switching devices 1 and 2 are not operating, the recording/playback device 3 is connected to the recording input device 4 and used for recording, and the recording/playback device 5 is connected to the distribution amplifier 6 and used for playback. It will be done. Audio information about the weather forecast inputted from a recording input device 4 such as a microphone is recorded on a recording/playback device 3 for recording via a switch 1.

On the other hand, by dialing a specific number from the telephone 7, the user can access the subscriber line 8. Exchanger 9° distribution amplifier 6,
It is connected via the recording/playback switching device 2 to the recording/playback device 5 for playback, so that audio information of the weather forecast can be listened to. When the input of new notification information to the recording/playback device 3 is completed, the switch 1
．． By operating contact a of 2, the recording/playback device 3
is used for playback, and the recording/playback device 5 is used for recording.

In this way, conventionally, two recording and playback devices were installed, one for recording and the other for playback, and when a new message was recorded, the device could be switched instantly and the one that was previously used for recording would be played back. It was also necessary to use the equipment that was originally intended for playback for recording purposes. As a result, two identical devices are required, a switching device is required, and the cost is high.

[Problem that the invention seeks to solve]

Therefore, the problem to be solved by the present invention is to enable recording and playback without requiring two identical devices, thereby reducing costs.

Therefore, it is an object of the present invention to provide a simultaneous recording and playback system that makes the above possible.

[Means and effects for solving the problem] In order to achieve the above object, the simultaneous recording and playback method according to the present invention includes an AD converter that receives an input audio analog signal, converts it into a digital signal, and outputs it, and an AD converter that receives the input digital signal. a DA converter for converting and outputting the audio analog signal into an audio analog signal, a central processing unit (hereinafter referred to as CPU), and an audio memory consisting of at least two, a first and a second audio memory; The digital signal taken in through the converter is written as recording data in the first memory, the digital signal written in the second memory is read out, converted into an audio analog signal by the DA converter, and output as playback data. Moreover, when a switching signal is input, the first memory, which had been used for recording, is used for playback, and the second memory, which had been used for playback, is used for recording. It is characterized by the fact that

〔Example〕

The present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 10 is a microphone input terminal, 11 is a tape recorder input terminal, 12 is a mixer, 13 is an amplifier, and 14 is an A
D converter, 15 is a serial/parallel conversion shift register, 16 is a buffer register, 17 is a parallel input/output circuit, 18 is a CPU (central processing unit), 19 is an audio memory (voice memo January 1), and (2) 2 20 is a buffer register, 21 is a parallel/serial conversion shift register, 22 is a DA converter, 23 is an amplifier, 2
4 is a digital output interface unit, 25 is C
PU bus, 26 is an analog output terminal, 27 is a digital output terminal, and 28 is a switching signal input terminal.

Next, the operation of the above embodiment will be explained. In FIG. 1, during recording, audio signals input from a microphone 10 and a tape recorder 11 are mixed by a mixer 12, and an amplifier 13
After being amplified by 64 K by AD converter 14
It is converted into a bit/s PCM (pulse code modulation) serial signal. This serial signal is converted into a parallel signal by a serial/parallel conversion shift register 15, and then passed through a buffer register 16 and a parallel input/output circuit 17 to the CPU.
For example, semiconductor memory (D-RA
M) is stored in the audio memory 19 composed of.

Also, during playback, the data stored in the audio memory 19 is transferred to the CPU 18. Parallel input/output circuit 17. Through the buffer register 20, the parallel/serial conversion shift register 2
1 is converted into a serial signal, converted into an analog signal by a DA converter 22, amplified by an amplifier 23, and then outputted as an analog signal.

In addition, if you want to output the digital signal as it is because of the convenience of relaying it to another device via a digital line, parallel
The serial signal converted by the serial conversion register 21 can be taken out from the digital output terminal 27 via the digital output interface unit 24.

In such a configuration, if the audio memory 19 is divided into two audio memories (1) and (2) under the control of the CPU 18 so that one can be used independently for recording and the other for playback. , it becomes possible to record new audio information at the same time as reproducing and outputting recorded audio information.

Furthermore, when the storage of new audio information in the audio memory (1) used for recording is completed, the switching signal input terminal 28
By inputting a switching signal from the audio memory (
11 for playback, and the audio memory (2) used for playback can be changed to use for recording. Note that in this case, a function that allows switching without interrupting the reproduced message can be implemented within the CPU 18.

FIG. 2 is a flowchart showing the flow of control operations of the CPU 18 in FIG.

The chart consists of steps (A) to (G). There is no need to explain these further.

〔Effect of the invention〕

As explained above, according to the present invention, recording and playback can be performed simultaneously and independently by controlling the audio memory in one recording and playback device, so that weather forecast notification services, etc. It has the advantage that it can be implemented more economically.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a flowchart showing the flow of control operations of the CPU in Fig. 1, and Fig. 3 is a block diagram showing a conventional example of a connection method for a weather forecast notification service. Figure. Code explanation 1.2...Switcher, 3.5...Recording and playback device, 4.
... Recording input device, 6... Distribution amplifier, 7... Telephone, 8... Subscriber line, 9... Exchange, IO...
Microphone input terminal, 11... tape recorder input terminal,
12...Mixer, 13...Amplifier, 14...AD
Converter, 15... Serial/parallel conversion shift register, 16... Buffer register, 17... Parallel input/output circuit, 18... CPU, 19... Audio memory, 20... Buffer register, 21 ...Parallel/serial conversion shift register, 22...DA converter, 23...Amplifier, 24...Digital output interface unit, 25...CPU bus, 26...
...Analog output terminal, 27...Digital output terminal, 28...Switching signal input terminal

Claims (1)

[Claims] 1) An AD converter that receives an input audio analog signal, converts it to a digital signal, and outputs it; a DA converter that receives an input digital signal, converts it to an audio analog signal, and outputs it; and a central processing unit (hereinafter referred to as CPU); a voice memory consisting of at least two, a first and a second;
The CPU writes the digital signal taken in through the AD converter into the first memory as recorded data, reads out the digital signal written in the second memory, converts it into an audio analog signal using the DA converter, and reproduces it. When the data is output and a switching signal is input, the first memory, which was previously used for recording, is switched to playback, and the second memory, which was previously used for playback, is switched to recording. This simultaneous recording and playback method is characterized in that it can be used simultaneously.